Alarm device



Patented June 17, 1924.

UNITED STATES* EDWARD LEWIS, y0.1" NEV YORK, N. Y.

ALARM DEVICE.

Applcationled March 17, 1922. Serial No#544,604.' i, v

fo all 107mm t may concern.' a

Be it known that I, EDWARD LEWIS, citizen of the United States, residing at New York, in the county and State'of New York, have invented certain new and useful Improvements in Alarm Devices, of which they following is a specilication.

This invention relates to a detonating de#r vice for use as a burglar alarm, and the like.

An object `of the invention is to provide a detonating device which may be quickly and easily fastened in position adjacent a relatively movable element such as a door, a

window, or other feature of house construction, and which will be operated by move ment of said movable element.

A more specific object is to provide a detonating device comprising a body part and a triggen part,1to provide means whereby the device may be held in position so lthat the trigger part, ywhenrset, will stand in the path of movement of a house door, or the like, in such manner that when the door is opened the trigger will be thrown to liring position against a suitable cartridge.

Other objectsand aims ofthe invention, more or less specific than those referred to above, will be in part obvious and in part pointed out in the course of the following description of the elements, combinations, arrangements of parts and applications vof principles, constituting the invention; and

the scope of protection contemplated will be indicated in the appended claims.

In the accompanying drawings which are to be taken as a part of this specification, and in which I have shown merely a preferred form of embodiment of the invention Figure 1 is a side elevational view of a device constructed in accordance with this invention, a portion thereof being shown in central section for the disclosure of details, and the device being shown in association with a door frame and door, and

Figure 2 is a front elevational view of the structure seen in Fig. 1.

Referring to the drawings for describing in detail the structure which is therein illus` trated, the reference character L indicates the door frame, while the reference character G indicates the door.

trate a relatively stationary part, as the door frame L, for carrying the detonating de- Vice which is indicated generally by the ref- These parts of house structure are shown merely to illus` erence character H, land a relatively m0vable part, as the door G..

The detonating device H consists of a main body portion '1 and a trigger portion 2.v The body portion is provided with a retaining thumb screw 3 by which it may be conveniently and securely attached to the 4 part L. The trigger 2 is pivotally mounted, as at 4, between a pair of ears 5 and 6k which project, from one end of the body. fThe heel. or pivot, portion ofthe trigger is notched to provide two substantially right angularly disposed walls 7 'and 8` arranged toreceive pressure from a spring pressed plunger 9, the wall being arranged to receive pressure when the trigger is in detonating position, and the rwall 8' being `ar-` ranged to receive pressure when the trigger is in set position. The plunger 9 is mounted in a cavity 10 provided for it within the body,`and it consists of a head portion 11 and a stem portion 12 which extends backwardly from the head and' is receive-diny a seat 13 of the body, said sea-t providing a shoulder, as 14, at its mouth against; whichthe rear end of the spring 15 abuts, the forward end of the spring being'disposed to press against the rear surface of the head. The plunger as thus constructed is mounted to swing freely from one side to the other of the center line of pivot 4 and about a pivot in the seat 13.

Vhen the trigger is in set7 position, as indicatedby the dotted lines in Fig. 1, the head 11 has its end pressing against the wall 8 of the trigger, movement of the trigger into set position having been limited by engagement of the wall 7 of the trigger against the head 11 and consequent engagement of the head 11 against the upper wall 16 of the cavity.

When the door G is moved 'open so that it engages and swings lthe trigger toward detonating position, such Imovement of the trigger will cause thehead of the plunger to be moved downwardly until as it passes the center line of pivot 4 it will suddenlyy snap to its lower position and exert its full force against the wall 7 for throwing the trigger against the cartridge 17 which is carried in a suitable chamber 18 of the body.

The trigger is provided with an appropriate form of detonating point, as 19. for directly striking the head of the cartridge. 1f desired a further enlargement of the trigger, as indicated at 20, may be provided for engaging the body to positively limit movement of the trigger toward detonating position, said enlargement being intended solely for the purpose of preventing injury to the point 19 in the event of operation of the trigger when no cartridge is in position to receive the blow.

It should be mentioned further that this device may be used in vaiious other instances than of giving an alarm against house burglary, for instance, it may be used as a safety alarm in connection with the operation of different kinds of engines, boilers, or other machinery, or as an alarm against the theft of automobiles and the like. Wvhen certain parts of such machinery or vehicles move to dangerous and improper limits they may trip the trigger of this device and produce detonation.

As,r various changes could be made in this construction without departing from the invention, it is to be understood that all matter contained inthe above description or shown inthe accompanying drawings is merely illustrativeof onev embodiment of the invention but,tliat the scope ofprotection contemplated is defined in the following claims.

Havingl thus described my invention, what l claim as new and desire to secure by Letters Patentisz l. An alarm device comprising a body portion and a trigger portion, means whereby the trigger portion is pivotally` connected with the body portion to swing between set and"detonating positions, and an operating member exerting a yielding pressure against said trigger port-ion adapted toA pass dead center for urging the trigger portion to either of its extreme positions, said operating means comprising a plunger spring pressed longitudinally against said trigger portion, and said trigger portion having a part thereof arranged to engage against a side surface portion of the plunger to thereby limit movement of the trigger portion in set position. s

2. An alarm device comprising a body portion and a trigger portion,imeans whereby the trigger portion is pivotally connectedswing the plunger against saidbody to thereby constitute the plunger as a stop engaged by said trigger extension to limit movement; of the trigger into set position.

In testimony whereof I affix my signature in the presence of two witnesses. i

' EDWARD LEWIS.

l/Jitnesses L. G-nssFoRD HANDY, ERNST Mnivfioii. 

